Fuel-supply system for internal-combustion engines



Deuil, 192.8. 1,694,805

s wlLTsE FUEL SUPPLY SYSTEM FOR INTERNAL COMBUSTION ENGINES Filed April l, 1927 IN V EN TOR.

50M/VER W/L 7295 BY fv" ATTORNEYS.

' parts of my improved device, as described in Patented Dec. 1l, 1928. UNITED .STATES PATENT OFFICE.

:umn wmrsn, or nmnorr, Homann, nssrGNon To wmrsn APPLIANcn courm, a conrom'rron or meinem.

FUEL-SUPPLY SYSTEM F03 INTERNAL-COBUSTION ENGINES.

Application med April 1, 192?. Serilal No. 180,178.

One of the' ob'ects of my invention is to provide means or controlling the flow of excess fuel from the fuel pump' means to the carburetor of an internal com ustion en- In the central portion of ou' 22 is 'provided a threadedaperture 27 in w ich is fitted an mternally. and externally threaded sleeve 28. A coll sprin 29 is positioned in the sleeve 28 with one en bearing against the'central portion of the diaphragm 26. Screw plug 30 is inserted in the outer end of sleeve 28 and bears agalnst the outer end of coil spring 29, thus adwstably holdin it in position against the dlaphragm 26. ap 31 is screwed upon the outer end of sleeve 28 and a gasket 32 may be insertedbetween the cap 31 and the end of sleeve 28 to effectively seal the same.

Chamber 11 is lprovided with a fuel inlet the specification, claimed in my claims and passage 40 in which is fitted a fuel feed pipe 41 shown in the accompanying drawings, in which leads to the fuel sup l The opposite which side of chamber 11 is provided7 with a fuel out- Fig. 1 is a central sectional view of my mlet passage 42which is fittedwith a fuel outproved device. let pipe 43 which leads to the carburetor of an Fig. 2 is a view taken on line 2 -2 of Fi 1. lnternal combustion engine. (not shown).

Fig. 3 is a side elevation, with parts lbro en Chamber 12 is provided with an oil inlet away, showing amodication of my device. passage 50 in which is fitted an oil inlet pip'e Fig. 4 is a view taken on line 4 4 of Fig. 3. 51 which leads to theoil pump of an internal I have shown a fuel pum comprising a combustionengine (not shown). The entire casing 10, the interior of whic is divided into pum mechanismv is preferably attached to two compartments 11 and 12 by a partition 13 the orward or rear end of the crankcase of inwhich are journaled shafts 14 and 15. On an engine ina position so that the end of the the ends of shafts 14 and 15 in compartment camshaft tmay engage the extension 20 of 11 are secured rotor blades 16 and 17 of the shaft 14 and thereby drive the pump. It is to shape shown in Fig. 2 which are so arranged be understood, however, that it may be otheras to pump fuel into and out of compartment 11 when they are rotated, but are provided with a slight clearance from each other and from the sides of the compartment so as to avoid wear from gritty particles which may be in the fuel pump. On the shafts 14 and 15 in compartment 12 are mounted gears 18 and 19 which are positioned to mesh. An exten-l sion 20 is provided on shaft 14 and is designed to be engaged by the end of camshaft of `an internal combustion engine or any other suitable driving means. The compartment 12 is provided with an apertured cover 21 through which shaft 14 extends. Compartment 11 is provided with a cover22. Covers 21 and 22 are secured to casing 10 by means of bolts 23 inserted through suitable apertures in the covers and through the holes 24 in the casing 10. The joints between the covers and casing may be sealed by interposing a lead gasket therebetween. The cover 22 is cup- Another object of m invention is to provide means for contro 'ng the flow' of fuel from the pump to the carburetor which will eliminate the neces-sity of an external bypass or return line for taking care of excess fuel.

With the above and other objects in view, my invention consists in the arrangement, combination and construction of the various shaft.

- In Figs. 3 and 4 I have shown a modification in which the aperture 27 and sleeve 28 are eliminated and a flat spring 40 is substituted by the coil spring 29. The central body portion of the flat spring "'bears against the central portion of the diaphragm`,vvhile its ends 61 and 62 bear against the inside: of the cover 22. Both coil spring 29 adat spring 60 are normally tensioned to hold the diaphragm 26 firmly against the edge of the casing 10, thereby sealing the compartment 11.

In operation, the rotation of the shaft 14 causes a rotation of the rotor 16, and the gear 18 which meshes with gear 19 rotates' shaft 15 and rotor 17. The rotors draw fuel from and opening 40 and force it out through opening 42 and pipe 43 to the carburetor (not shaped and the rim 25 thereof bears against shown). In order to avoid flooding the carthe outer edge of the casing l() leaving the buretor, a restriction valve which may cominner edge of the casing 10 free to support a prise merely a filler for pipe 43 with a rediaphragm 26 which is positioned thereon. stricted longitudlnal opening therein, or any wise driven as, for instance, by the distributor the tank (not shown)` through the pipe 41 Y within pipe 43 adjacent the opening 42. The

restricted opening is of a size which will insure adequate but inot Yexcessive supply of fuel to the carburetor and will build up a f back pressure in the um chamber. -When a larger quantity of el 1s presented to the restricted opening in pipe 43 than will readily pass therethrough the 'same will back up on the outlet side of thepump, buildup a pressure there suicient to force the dlaphragm 26 outwardly against the tension of spring 29 or spring 60, and permit the excess l fuel to pass back to the inlet side of the pump which will prevent the intake of more fuel through inlet opening 60 until the outlet pipe 43 with its restricted opening'isable to carry away the excess within the pump. The necessity of an outside bypass or areturn line is thus eliminated.

It will be quite ap arent that the amount of fuel pumped by t e pump elements and correspondingly t e pressure in the pumpv chamber will vary in relation to the speed ofV rotation ofthe elements andthat the amount of 'opening of vthe' diaphragm proportionately to permit o greater slippage at higher speeds. v v

Itj'will be obvious that various changes "may be made inthe arrangement, combinaf` tion .and construction of the various parts of my improved device ,without departing from.

the spirit of -m invention,` and it is my intention to cover my may be-reasona ly' mcluded within the. scope thereof.

'What I claim is: v

l. In combination, a pump housing having fluid' inlet and outlet passages, a pump element inthe housinga movable diaphragm formin one Wall of the housing, an extension o the housing positioned beyond thel diaphragm, an adjustable member in the extensionv and yielding meansA positioned between the diaphragm and adjustable means,

whereby adjustable pressure may be exerted 26 will vary claims such changes as y 'Leeaeoa on the diaphragm' from without the housing proper.

2. In combination, a pump housing having fluid inlet and ,outlet passages, a pump elementin the housing, a'm'ovable diaphragm forming one Wall ofthe housing,an extension of the housing positioned beyond the diaphragm, an adjust-able plug threaded in the extension, and yielding means positioned between the diaphragm and plug','whereby adjustable pressure may be exertedon the ldiaphragm from without the' housing proper.

3. linv combination, a pump. housing hav- 'ing fluid inlet 'and outlet-j passages, )a pump element in the housino, a movable diaphragm forming one walloiP the housing, a. sleeve forming a part of the extension and open to the diaphragm, an adjustable plug closing the other end of the sleeve and yielding means positioned betweens'aid diaphragm and plug, whereby adjustable pressure may be exerted on .the diaphragm from Y'withoutythe housing om with-v velement in the housing, a movable diaphragm forming one wall of thehousin' a cap over' the diaphragm, a sleeve on sai cap, a plug threadably Ireceived by the interiorof-said sleeve, a cap sealin the outer end of .said sleeve, and yieldab e means interposed between said plug and .said diaphragm, said plug being adjustable. whereby to vary the tension of said yieldable'meana SUMNER WnfrsE. 

